Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5fd84bc1f24885…

MALICIOUS

PDF

77.5 KB Created: 2020-12-16 06:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 133893358c5d8ad338d297e577b8f282 SHA-1: d319163a336efab73fb715b73e580ab1a38030b0 SHA-256: cb5fd84bc1f24885b5c93034aed9c433afaee3c4acf2c15fb5a647e608686ec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a malicious intent to redirect users. The presence of a suspicious URL, 'https://traffking.ru/123?utm_term=wildlife+park+3+review', further supports this. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/123?utm_term=wildlife+park+3+review
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f8efff04d7ee.pdf
    • https://xozavakude.weebly.com/uploads/1/3/4/5/134581018/lamepezejoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0298efbc-fcfb-42a2-a5fb-84fd756afcfc/the_great_gatsby_questions_chapter_3.pdf
    • https://uploads.strikinglycdn.com/files/c17ca149-ce58-4a7a-ac63-bdd6a8ad962c/naten.pdf
    • https://static1.squarespace.com/static/5fc2f4615687f52b6b8e9594/t/5fcc42985177ea328cb5ca27/1607221916464/xolekejovedajewaza.pdf
    • https://static1.squarespace.com/static/5fc668c6085bf90c0e22d7bb/t/5fcaa669fdef016eae8a2718/1607116394142/nisegi.pdf
    • https://static1.squarespace.com/static/5fc080f7bf71053ccb0e3c67/t/5fc204fe645712565483200b/1606550784385/56966993826.pdf
    • https://uploads.strikinglycdn.com/files/e9e3ebb8-64a6-48b1-a646-d065258814ad/living_environment_regents_review_qu.pdf
    • https://uploads.strikinglycdn.com/files/f6913360-b7cb-4d8b-9fee-e5ed61b63a2a/cis_and_trans_isomers_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e638.bin
6593bda91e83a13c99aa3d01bfefbe4e8760d51327132777cf8ed4026ed48707
pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 4740 bytes
font_01_sfnt_off0000f675.bin
1cd7d4defb9b33206dd730fddf2058fa3d5dfb050af981aceba414ab4ea3807d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10292 bytes
font_02_sfnt_off000119bd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 4324 bytes